Western governors want to see more federal action to combat tiny but destructive creatures: invasive mussels.

A quagga mussel is only about the size of your thumbnail. But when the little mollusk reproduces en masse, it can wreak havoc on agriculture and lake tourism.

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"Clogging infrastructure, hydropower systems, municipal water systems, irrigation system," said Nic Zurfluh, who manages the invasive species program within the Idaho Department of Agriculture.

They also alter the makeup of a freshwater body by gobbling up excessive amounts of phytoplankton. As a result, Zurfluh says contaminated lakes have fewer and smaller native fish and other species.

Quagga and zebra mussels are already a big problem in several Western states including Utah and Montana. The mussels are impossible to get rid of once they contaminate a waterway, so Idaho is working hard to make sure they don’t sneak into the Snake River Basin.

The mussels travel from one lake to the next by hitching a ride on boats. Several states have border checkpoint programs in place to prevent the spread of the invasive species, but Western governors are urging for more action and coordination between federal agencies.

In 2017, Idaho and Utah teamed up to coordinate inspection and contamination prevention efforts between the two states.

This story was produced by the Mountain West News Bureau, a collaboration between Wyoming Public Media, Boise State Public Radio in Idaho, Yellowstone Public Radio in Montana, KUER in Salt Lake City and KRCC and KUNC in Colorado.

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Idaho continues to try and keep invasive mussels out of its waterways with a new agreement with Utah.

Idaho has been trying to keep quagga and zebra mussels out of lakes and reservoirs since 2009. The state operates inspection stations along its borders to track down boats that may be contaminated with the invasive species and keep them out of Idaho waters.

Montana, Utah and Nevada all have the invasive species, which attach to boats and can spread easily from different bodies of water. They can kill native lake species and cost millions of dollars in damage and mitigation. They first appeared in the Great Lakes after Eastern European boats introduced them in the 1980s.

Idaho officials intercepted a boat Tuesday on U.S. Highway 93 that was carrying a potentially harmful invasive species.

The boat was moored in Lake Mead, Nevada, which is infested with quagga and zebra mussels. When it entered Idaho, the owners were required to stop at one of the state’s 16 inspection stations to ensure none of the invasive species were brought into the state.

But Lloyd Knight, with Idaho’s Department of Agriculture, said that’s not what happened.